unlink

问题 I have two files: b.php and test.txt <?php $b = \"test.txt\"; unlink($b); ?> and the error is: Warning: unlink(test.txt) [function.unlink]: Permission denied why? b.php and test.txt is 777 and the same group/login if I set 777 on the parent directory I can execute unlink but i have to set 777 and back to 755? 回答1: You (as in the process that runs b.php , either you through CLI or a webserver) need write access to the directory in which the files are located. You are updating the directory